Trey's user avatar
Trey's user avatar
Trey's user avatar
Trey
  • Member for 6 years, 9 months
  • Last seen more than a month ago
  • Kaiserslautern, Germany
221 votes
8 answers
104k views

How much would it cost in U.S. dollars to brute-force a 256-bit key in a year?

  • 2,313
86 votes
10 answers
18k views

In end-to-end encryption, doesn't the server need to be trusted?

  • 979
58 votes
2 answers
47k views

Understanding the length extension attack

56 votes
6 answers
49k views

Why is AES resistant to known-plaintext attacks?

47 votes
2 answers
12k views

Why is SHA-1 considered broken?

42 votes
4 answers
15k views

Cryptography algorithms that take longer to solve on a GPU than a CPU

  • 429
40 votes
2 answers
22k views

Why do we use encrypt-decrypt-encrypt (EDE) in 3DES, rather than encrypting three times?

  • 573
40 votes
4 answers
94k views

Calculating RSA private exponent when given public exponent and the modulus factors using extended Euclid

29 votes
8 answers
9k views

Can you use memory errors as a source of randomness for cryptography?

27 votes
2 answers
29k views

How does a chosen ciphertext attack work, with a simple example?

  • 475
26 votes
4 answers
6k views

What makes Quantum Cryptography secure?

  • 373
25 votes
5 answers
58k views

What is the lowest level of mathematics required in order to understand how encryption algorithms work?

25 votes
2 answers
32k views

Key derivation functions (KDF): What are they, what are their main purposes and how they can be used?

21 votes
3 answers
21k views

How does one calculate a primitive root for Diffie-Hellman?

  • 679
15 votes
2 answers
7k views

How exactly does key whitening manage to increase security?

  • 379
12 votes
2 answers
9k views

How does a certificate authority issue a digital certificate?

10 votes
1 answer
679 views

AES-128. Do there exist two different keys for a pair (text, encrypted text)?

  • 103
10 votes
3 answers
715 views

Using weak hash functions to construct a stream cipher

  • 13.8k
8 votes
1 answer
11k views

Complement property of DES

  • 529
6 votes
2 answers
2k views

Questions about Key Derivation Functions

  • 2,360
6 votes
1 answer
19k views

Benchmark differences between SHA-512 and bcrypt

5 votes
2 answers
1k views

Why are stream ciphers based on linear-feedback shift registers so popular?

  • 61
5 votes
1 answer
895 views

What is the significance of IV in stream ciphers like Trivium?

  • 63
4 votes
1 answer
2k views

Why do digital signatures use a hash algorithm instead of a checksum?

4 votes
3 answers
15k views

Chosen plaintext vs Chosen ciphertext

  • 133
4 votes
1 answer
27k views

How to accurately calculate Unicity Distance for English?

  • 141
1 vote
1 answer
218 views

Proof of probability of weak keys in block cipher

  • 169
0 votes
1 answer
597 views

DES Weak Keys - Double Encryption

-2 votes
1 answer
885 views

Is it possible to attack an SHA-256 hash seeded with PHP’s mt_rand function?